import z from "zod";

/**
 * Boundary schema for `MoneyLike`. Amount is `bigint` (minor units —
 * cents, pence, satoshi, lamports). JSON cannot natively carry bigints,
 * so the schema accepts either a JSON-number, a numeric string, or a
 * bigint literal and coerces via `BigInt()`. Currency is a 3-8 char
 * ISO 4217 code (or caller-registered identifier — `BTC`, `USDC`,
 * `LAMPORTS`).
 */
export const MoneySchema = z.object({
    amount: z.preprocess((val) => {
        if (typeof val === "bigint") return val;
        if (typeof val === "number" && Number.isFinite(val)) {
            return BigInt(Math.trunc(val));
        }
        if (typeof val === "string" && /^-?\d+$/.test(val)) {
            return BigInt(val);
        }
        return val;
    }, z.bigint().nonnegative()),
    currency: z
        .string()
        .min(3)
        .max(8)
        .regex(/^[A-Z0-9]+$/u, "currency must be uppercase letters or digits"),
});

export type Money = z.infer<typeof MoneySchema>;